Examples > Kinematic > Pipe-like surfaces

Pipe-like surfaces.

Let's create a pipe-like surface with an arc-clip and a contour-profile consitsing of arcs and line segments.

This code creates arc-clips:

SG_ARC ArcGeo;

SG_POINT ArP1 = {1.0, -4.0, 0.0};

SG_POINT ArP2 = {1.0, -3.6, 0.0};

SG_POINT ArP3 = {1.2, -3.5, 0.0};

ArcGeo.FromTreePoints(ArP1,ArP2,ArP3,false);

sgC2DObject* ar = sgCreateArc(ArcGeo);

sgGetScene()->AttachObject(ar);

ar->SetAttribute(SG_OA_COLOR,12);

ar->SetAttribute(SG_OA_LINE_THICKNESS, 2);

Now let's create a contour-profile consisting of 2 line segments and 4 arcs:

sgCObject* objcts[6];

objcts[0] = sgCreateLine(0.0, -4.0, 0.0, 0.0, -2.0, 0.0);

ArP1.x = 0.0; ArP1.y = -2.0; ArP1.z = 0.0;

ArP2.x = 1.0; ArP2.y = -1.0; ArP2.z = 0.0;

ArP3.x = 0.4; ArP3.y = -1.2; ArP3.z = 0.0;

ArcGeo.FromTreePoints(ArP1,ArP2,ArP3,false);

objcts[1] = sgCreateArc(ArcGeo);

ArP1.x = 1.0; ArP1.y = -1.0; ArP1.z = 0.0;

ArP2.x = 2.0; ArP2.y = 0.0; ArP2.z = 0.0;

ArP3.x = 1.9; ArP3.y = -0.5; ArP3.z = 0.0;

ArcGeo.FromTreePoints(ArP1,ArP2,ArP3,false);

objcts[2] = sgCreateArc(ArcGeo);

ArP1.x = 2.0; ArP1.y = 0.0; ArP1.z = 0.0;

ArP2.x = 1.0; ArP2.y = 1.0; ArP2.z = 0.0;

ArP3.x = 1.6; ArP3.y = 0.8; ArP3.z = 0.0;

ArcGeo.FromTreePoints(ArP1,ArP2,ArP3,false);

objcts[3] = sgCreateArc(ArcGeo);

objcts[4] = sgCreateLine(1.0, 1.0, 0.0, -1.0, 1.0, 0.0);

ArP1.x = -1.0; ArP1.y = 1.0; ArP1.z = 0.0;

ArP2.x = -1.0; ArP2.y = 0.0; ArP2.z = 1.0;

ArP3.x = -1.1; ArP3.y = 1.0; ArP3.z = 0.0;

ArcGeo.FromTreePoints(ArP1,ArP2,ArP3,false);

objcts[5] = sgCreateArc(ArcGeo);

sgCContour* cnt1 = sgCContour::CreateContour(objcts,6);

sgGetScene()->AttachObject(cnt1);

cnt1->SetAttribute(SG_OA_COLOR,12);

cnt1->SetAttribute(SG_OA_LINE_THICKNESS, 2);

Further you must define both a point in the arc-clip plane which will move along the profile, and a rotation angle around this point. Let this point be (1, -4, 0) and the rotation angle 0 degrees. Let's build a surface:

SG_POINT point_in_plane = {1.0, -4.0, 0.0};

bool close = false;

sgC3DObject* pipO = (sgC3DObject*)sgKinematic::Pipe((const sgC2DObject&)(*ar),NULL,0,

(const sgC2DObject&)(*cnt1), point_in_plane, 0.0, close);

sgGetScene()->AttachObject(pipO);

pipO->SetAttribute(SG_OA_COLOR,25);

Then we'll move the obtained surface:

SG_VECTOR transV1 = {2.5,1,0};

pipO->InitTempMatrix()->Translate(transV1);

pipO->ApplyTempMatrix();

pipO->DestroyTempMatrix();